@conference {DeTroyer2007, title = {Conceptual Modeling for Virtual Reality}, booktitle = {Proceedings of the 26th International Conference on Conceptual Modeling (ER) - Tutorials, Posters, Panels and Industrial Contributions}, year = {2007}, publisher = {CPRIT}, organization = {CPRIT}, address = {Auckland, New Zealand}, author = {De Troyer, O. and F. Kleinermann and B. Pellens and W. Bille} }